Question

In a square garden, The width is increased by 1meter and length by 3 meter. The area will be increased by 19 sq.m than the present area.Find the length
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Answer 1

The answer is in the image. Please comment if unclear.

Answer 2

we know that perimeter of a square=4s
the the side be x then
x²+19=(x+1)(x+3)=x²+3x+x+3
19=4x+3
x=4 so the sides are of 4m